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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-08-26 06:24:13 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-08-28 09:05:39 +0400
commit77a53fd21870c726b670c0d8179294ac1ea33468 (patch)
treea936dfad89adadd165fb4e114d3f8e71736585f9 /include/linux/input
parent8fbac18e8edd974b5234d96a9b8e2a26ab2ac556 (diff)
downloadlinux-77a53fd21870c726b670c0d8179294ac1ea33468.tar.xz
Input: matrix-keypad - add function to build device keymap
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'include/linux/input')
-rw-r--r--include/linux/input/matrix_keypad.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h
index 15d5903af2dd..b3cd42d50e16 100644
--- a/include/linux/input/matrix_keypad.h
+++ b/include/linux/input/matrix_keypad.h
@@ -63,4 +63,36 @@ struct matrix_keypad_platform_data {
bool wakeup;
};
+/**
+ * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
+ * @keymap_data: keymap supplied by the platform code
+ * @row_shift: number of bits to shift row value by to advance to the next
+ * line in the keymap
+ * @keymap: expanded version of keymap that is suitable for use by
+ * matrix keyboad driver
+ * @keybit: pointer to bitmap of keys supported by input device
+ *
+ * This function converts platform keymap (encoded with KEY() macro) into
+ * an array of keycodes that is suitable for using in a standard matrix
+ * keyboard driver that uses row and col as indices.
+ */
+static inline void
+matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
+ unsigned int row_shift,
+ unsigned short *keymap, unsigned long *keybit)
+{
+ int i;
+
+ for (i = 0; i < keymap_data->keymap_size; i++) {
+ unsigned int key = keymap_data->keymap[i];
+ unsigned int row = KEY_ROW(key);
+ unsigned int col = KEY_COL(key);
+ unsigned short code = KEY_VAL(key);
+
+ keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
+ __set_bit(code, keybit);
+ }
+ __clear_bit(KEY_RESERVED, keybit);
+}
+
#endif /* _MATRIX_KEYPAD_H */